Australia 1933 (Dec. 29), cover sent by "Rocket Post K1" from Stausee to Murtal. Date cachet in red December 29th 1933, also double line flight cachet in red. Label "Rocket Catapult" in red white and blue. Rocket Catapult 20 Groschen Stamp. Cover autographed by the inventor Friedrich Schmiedl, who was the first in the world to transport mail by rockets on February 2nd 1931
